Patents by Inventor Ahmed Elshennawy
Ahmed Elshennawy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9013233Abstract: In a high-performance interface circuit for micro-electromechanical (MEMS) inertial sensors, an excitation signal (used to detect capacitance variation) is used to control the value of an actuation signal bit stream to allow the dynamic range of both actuation and detection paths to be maximized and to prevent folding of high frequency components of the actuation bit stream due to mixing with the excitation signal. In another aspect, the effects of coupling between actuation signals and detection signals may be overcome by performing a disable/reset of at least one of and preferably both of the detection circuitry and the MEMS detection electrodes during actuation signal transitions. In a still further aspect, to get a demodulated signal to have a low DC component, fine phase adjustment may be achieved by configuring filters within the sense and drive paths to have slightly different center frequencies and hence slightly different delays.Type: GrantFiled: September 13, 2011Date of Patent: April 21, 2015Assignee: Si-Ware SystemsInventors: Ahmed Elmallah, Ahmed Elshennawy, Ahmed Shaban, Botros George, Mostafa Elmala, Ayman Ismail, Mostafa Sakr, Ahmed Mokhtar, Ayman Elsayed
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Patent number: 8872683Abstract: Operating capacitive sensors in force feedback mode has many benefits, such as improved bandwidth, and lower sensitivity to process and temperature variation. To overcome, the non-linearity of the voltage-to-force relation in capacitive feedback, a two-level feedback signal is often used. Therefore, a single-bit ?-? modulator represents a practical way to implement capacitive sensors interface circuits. However, high-Q parasitic modes that exist in high-Q sensors (operating in vacuum) cause a stability problem for the ?-? loop, and hence, limit the applicability of ?-? technique to such sensors. A solution is provided that allows stabilizing the ?-? loop, in the presence of high-Q parasitic modes. The solution is applicable to low or high order ?-? based interfaces for capacitive sensors.Type: GrantFiled: February 26, 2014Date of Patent: October 28, 2014Assignee: Si-Ware SystemsInventors: Ayman Ismail, Ahmed Elshennawy, Ahmed Mokhtar, Ayman Elsayed
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Publication number: 20140240156Abstract: Operating capacitive sensors in force feedback mode has many benefits, such as improved bandwidth, and lower sensitivity to process and temperature variation. To overcome, the non-linearity of the voltage-to-force relation in capacitive feedback, a two-level feedback signal is often used. Therefore, a single-bit ?-? modulator represents a practical way to implement capacitive sensors interface circuits. However, high-Q parasitic modes that exist in high-Q sensors (operating in vacuum) cause a stability problem for the ?-? loop, and hence, limit the applicability of ?-? technique to such sensors. A solution is provided that allows stabilizing the ?-? loop, in the presence of high-Q parasitic modes. The solution is applicable to low or high order ?-? based interfaces for capacitive sensors.Type: ApplicationFiled: February 26, 2014Publication date: August 28, 2014Applicant: Si-Ware SystemsInventors: Ayman Ismail, Ahmed Elshennawy, Ahmed Mokhtar, Ayman Elsayed
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Patent number: 8508290Abstract: In a high-performance interface circuit for micro-electromechanical (MEMS) inertial sensors, an excitation signal (used to detect capacitance variation) is used to control the value of an actuation signal bit stream to allow the dynamic range of both actuation and detection paths to be maximized and to prevent folding of high frequency components of the actuation bit stream due to mixing with the excitation signal. In another aspect, the effects of coupling between actuation signals and detection signals may be overcome by performing a disable/reset of at least one of and preferably both of the detection circuitry and the MEMS detection electrodes during actuation signal transitions. In a still further aspect, to get a demodulated signal to have a low DC component, fine phase adjustment may be achieved by configuring filters within the sense and drive paths to have slightly different center frequencies and hence slightly different delays.Type: GrantFiled: September 13, 2011Date of Patent: August 13, 2013Inventors: Ayman Elsayed, Ahmed Elmallah, Ahmed Elshennawy, Ahmed Shaban, Botros George, Mostafa Elmala, Ayman Ismail, Mostafa Sakr, Ahmed Mokhtar
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Patent number: 8476970Abstract: In a high-performance interface circuit for micro-electromechanical (MEMS) inertial sensors, an excitation signal (used to detect capacitance variation) is used to control the value of an actuation signal bit stream to allow the dynamic range of both actuation and detection paths to be maximized and to prevent folding of high frequency components of the actuation bit stream due to mixing with the excitation signal. In another aspect, the effects of coupling between actuation signals and detection signals may be overcome by performing a disable/reset of at least one of and preferably both of the detection circuitry and the MEMS detection electrodes during actuation signal transitions. In a still further aspect, to get a demodulated signal to have a low DC component, fine phase adjustment may be achieved by configuring filters within the sense and drive paths to have slightly different center frequencies and hence slightly different delays.Type: GrantFiled: September 13, 2011Date of Patent: July 2, 2013Inventors: Ahmed Mokhtar, Ahmed Elmallah, Ahmed Elshennawy, Ahmed Shaban, Botros George, Mostafa Elmala, Ayman Ismail, Mostafa Sakr, Ayman Elsayed
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Publication number: 20120235725Abstract: In a high-performance interface circuit for micro-electromechanical (MEMS) inertial sensors, an excitation signal (used to detect capacitance variation) is used to control the value of an actuation signal bit stream to allow the dynamic range of both actuation and detection paths to be maximized and to prevent folding of high frequency components of the actuation bit stream due to mixing with the excitation signal. In another aspect, the effects of coupling between actuation signals and detection signals may be overcome by performing a disable/reset of at least one of and preferably both of the detection circuitry and the MEMS detection electrodes during actuation signal transitions. In a still further aspect, to get a demodulated signal to have a low DC component, fine phase adjustment may be achieved by configuring filters within the sense and drive paths to have slightly different center frequencies and hence slightly different delays.Type: ApplicationFiled: September 13, 2011Publication date: September 20, 2012Inventors: Ahmed Elmallah, Ahmed Elshennawy, Ahmed Shaban, Botros George, Mostafa Elmala, Ayman Ismail, Mostafa Sakr, Ahmed Mokhtar, Ayman Elsayed
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Publication number: 20120235726Abstract: In a high-performance interface circuit for micro-electromechanical (MEMS) inertial sensors, an excitation signal (used to detect capacitance variation) is used to control the value of an actuation signal bit stream to allow the dynamic range of both actuation and detection paths to be maximized and to prevent folding of high frequency components of the actuation bit stream due to mixing with the excitation signal. In another aspect, the effects of coupling between actuation signals and detection signals may be overcome by performing a disable/reset of at least one of and preferably both of the detection circuitry and the MEMS detection electrodes during actuation signal transitions. In a still further aspect, to get a demodulated signal to have a low DC component, fine phase adjustment may be achieved by configuring filters within the sense and drive paths to have slightly different center frequencies and hence slightly different delays.Type: ApplicationFiled: September 13, 2011Publication date: September 20, 2012Inventors: Ayman Elsayed, Ahmed Elmallah, Ahmed Elshennawy, Ahmed Shaban, Botros George, Mostafa Elmala, Ayman Ismalt, Mostafa Sakr, Ahmed Mokhtar
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Publication number: 20120235724Abstract: In a high-performance interface circuit for micro-electromechanical (MEMS) inertial sensors, an excitation signal (used to detect capacitance variation) is used to control the value of an actuation signal bit stream to allow the dynamic range of both actuation and detection paths to be maximized and to prevent folding of high frequency components of the actuation bit stream due to mixing with the excitation signal. In another aspect, the effects of coupling between actuation signals and detection signals may be overcome by performing a disable/reset of at least one of and preferably both of the detection circuitry and the MEMS detection electrodes during actuation signal transitions. In a still further aspect, to get a demodulated signal to have a low DC component, fine phase adjustment may be achieved by configuring filters within the sense and drive paths to have slightly different center frequencies and hence slightly different delays.Type: ApplicationFiled: September 13, 2011Publication date: September 20, 2012Inventors: Ahmed Mokhtar, Ahmed Elmallah, Ahmed Elshennawy, Ahmed Shaban, Botros George, Mostafa Elmala, Ayman Ismail, Mostafa Sakr, Ayman Elsayed